I have emailed Four Winns regarding the 378 Vista AC issue - they claim the AC condensation drip pan drains through a straight drain line that exits through the hull and suspects that this line is clogged.
I spent several hours over the weekend tinkering with this issue. I've posted my response back to Four Winns below. Apologize for the long message, but I figured that more detail should help find the solution to this issue. I've posted here in case any of you have additional suggestions.
MESSAGE:
Please see the follow-up question to my 378 Vista air conditioning issue. I've had 2 mechanics check out the problem to no avail. This is an issue because we cannot run our AC without getting water in the cabin.
I checked the drain line for the AC condensation drip pan. Here's what I did:
1. I removed the line and it looked to be clear (at least through the T connecter that combines both drip pan lines.
2. I managed to pour about 6oz of bottled water down the line. Then I heard what sounded like a sump or bilge pump, and some of the water came gushing back up the drain line. After that, I successfully poured about 30oz (3 bottled waters) down the drip pan drain line with no issue.
3. Thinking the line must be clear, I reconnected the drip pan drain line and ran the AC constantly for about a day. No issues, the condensation drip pan appeared to be draining just fine.
4. Then, all of sudden, the drip pan began to fill up with water. I watched the water level in the pan for several minutes and noticed that whenever I heard the same sump/bilge pump noise as noted in #2 above, the water level in the drip pan would again rise.
5. I turned off the AC and monitored the drip pan water level for several hours. It would appear to drain (very slowly), then rise again a short time later (without the AC running).
All of this occurred while we were docked at our slip.
As you can tell, this has me very confused, especially if the condensation drip pan drain line is supposedly a straight drain line through the hull.
Again, my boat is a 2005 378 Vista and the AC unit is located in a closet under the cabin stairs
Thanks,
edziedzic
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